# Statistics - Probability

A certain medical test has the following characteristics. In case of a viral infection, the test shows positive with probability 0.8. Even if there is no viral infection, the test shows positive with probability 0.1. There is a 1/5 chance that any patient has a viral infection. If a patient tests positive on this test, what is the probability that he/she has a viral infection?

a. 2/3

b. 1/5

c. 3/4

d. 1/3

https://brainmass.com/statistics/probability/260440

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